Canola (Brassica napus L.) is a nitrogen (N)-demanding crop, so tissue N analysis should be related to soil supply. We evaluated canola uptake in relation pools plots receiving 0, 50, 100 and 150 kg ha-1 from urea at three sites eastern Canada 2012. Soil varied significantly the rosette, flowering, pod filling maturity stages, but responded less predictably urea. was inconsistently input. This ...

The paper studies the processes of transformation molecular structure humic (HA) and fulvic acids (FA) leached chernozem under influence fertilizers meliorant. research was carried out conditions many years stationary experiment Department Agrochemistry, Soil Science Agroecology FSBEI HE Voronezh SAU. Samples low-humus thin heavy-loamy were analyzed. isolated purified preparations HA FA studied...

This study examined the diversity, abundance and evenness of butterfly pollinators in Kumaun region, Uttarakhand from March 2019 to February 2020. A total 394 butterflies, representing 40 species five families were collected. Nymphalidae was most dominant family with 19 species, followed by Pieridae (9 species), Lycaenidae Papilionidae (2 Hesperiidae (1 respectively. Pieris canidia indica (Evan...

The main purpose of the article is to substantiate restrictive content a sustainable development concept and show how it implemented in theoretical foundations agriculture. Today, initial has changed beyond recognition continued large-scale consumption natural resources. Consequently, very sustainability requires clarification. It necessary look for its signs ecosystems, where indicator life it...

The traditional agriculture land use system in Indian Himalayan region is an integral part of the society and local environment as in that the crop husbandry, animal husbandry and forests constitute interlinked systems. But due to variety of factors the land use under traditional crops is changing very fast in a part of Indian Himalayan region. This kind of land intensification is a severe thre...

Increased adoption of new activities such as aquaculture into existing agroecosystems calls for the application of simulation models to analyze and forecast consequences of new agroecosystem designs (Elliot and Cole, 1989; Edwards et al., 1988). The main objective of integrated systems is to enhance nutrient cycling and energy flow in the system to obtain maximum benefits in the production of f...

Monarch butterflies (Danaus plexippus) frequently consume milkweed in and near agroecosystems and consequently may be exposed to pesticides like neonicotinoids. We conducted a dose response study to determine lethal and sublethal doses of clothianidin using a 36-h exposure scenario. We then quantified clothianidin levels found in milkweed leaves adjacent to maize fields. Toxicity assays reveale...

We examined four strategies (Tris/EDTA, sodium dodecyl sulfate, Chelex 100 resin and cetyltrimethylammonium bromide -CTAB-) for extracting nucleic acid (DNA) from communities of nematodes. Nematodes were isolated from an agricultural area under different management of long-term crop rotation experiment from Argentina during three seasons. After DNA extraction, Polymerase Chain Reaction-amplific...

Long-term successional dynamics of an inoculum of arbuscular mycorrhizal fungi (AMF) associated with the maize rhizosphere (from traditionally managed agroecosystems in Los Tuxtlas, Veracruz, Mexico), was followed in Bracchiaria comata trap cultures for almost eight years. The results indicate that AMF diversity is lost following long-term subculturing of a single plant host species. Only the d...

Elevated atmospheric CO2 concentration can increase biomass production and alter tissue composition. Shifts in both quantity and quality of crop residue may alter carbon (C) and nitrogen (N) dynamics and management considerations in future CO2-enriched agroecosystems. This study was conducted to determine decomposition rates of the legume soybean [Glycine max (L.) Merr.] and nonlegume grain sor...